1[1] J J Cox， et al. Space-filling curves in tool-path appl ication[J]. Computer-Aided Design, 1994,26(3):215－214．
2[2] Les Piegl Wayne Tiller. The NURBS book[M]，1995．
3[3] Elber G，Cohen E. Toolpath generation for freeform surfaces models[J ]. Computer-Aided Design，1994,26(6):490－496．
4[4] Zhu C. Tool-path generation in manufacturing sculptured surfaces with a cylindrical end-milling cutter[J]. Computers in Industry, 1991,17:385－389．
